Pumping assembly



Aug. 9, 1938. I c. HARBORDT 2,126,385

PUMPING ASSEMBLY Original Filed July 5, 1933 Hlllllll 'Hlll INVENTOR.Car/ GZHQrba/"df TTORNEY.

Patented Aug. 9, 1938 UNITED STATES PATENT OFFlCE 678,788. 1936, SerialNo. 89,889

1 Claim.

My invention relates to pumping assemblies and more particularly to anelectric motor and pump combination in which the pump is glandless.

This application is a divisional application of my copendingapplication, Serial No. 678,788, filed July 3, 1933.

In pumping assemblies for mechanical refrigerators, it is essential thatthe refrigerant fluid or the like, being circulated, does not leak intothe space being refrigerated because it is used for the storage of food.Most glands will leak in time, releasing the fluid.

One object of my invention is to provide a glandless pump and motorassembly.

Another object of my invention is to provide a pumping system in whichthe motor and pump are hermetically sealed.

Other and further objects of my invention will appear from the followingdescription.

In the accompanying drawing which forms part of the instantspecification and is to be read in conjunction therewith and in whichlike reference numerals are used to indicate like parts in the variousviews;

Figure 1 is a diagrammatic sectional elevation of one form of pumpingand motor assembly embodying my invention.

Figure 2 is a sectional view taken on the line 2-2 of Figure 1.

Figure 3 is a sectional view taken on the line 33 of Figure 1.

In general, my invention contemplates enclosing the rotor of aninduction motor within a hermetically sealed casing through which thepole pieces project. The rotor is connected in any suitable manner fordriving a pump of any suitable design, also enclosed in a casing, theconstruction being such that no gland need be used.

Referring now to the drawing, a casing I, made of any suitable,non-metallic material, as for example, a phenol condensation product, issuitably joined to a ring 2, carrying a flange 3. A suitable inset 4 isprovided in the casing l to act as a bearing for the shaft 5 of theelectric motor, The rotor 6 of the motor is secured to shaft 5. Thestator of the motor is provided with pole pieces 8 around which thewindings 9 are placed. The pole pieces 8 are adapted to fit upon polepiece extensions it) which are merged into and form part of the casingI. It is necessary that the pole piece extensions IE! extend through thecasing in order that the magnetic gap between the poles and the rotor bemade as small as possible to enable efficient performance. The stator isheld in removable position by means of screws Divided and thisapplication July 10,

II, as can readily be seen by reference to Figure 1. Secured to shaft 5is a gear l2 forming part of the reduction gearing. Gear l2 meshes withgear [3 secured to shaft M which carries a gear l5 for rotationtherewith, in turn meshing with a gear [6 which drives a shaft I6 towhich the pump impeller I! is secured.

The gearing just described is housed within housing 3 which is securedto flange 3 by bolts 19. Pump housing 20 is secured to the housing 18 bymeans of bolts 2| passing through flanges 22 and 23. The pump is adaptedto take suction from conduit 24 and discharge to conduit 25. When fluidleaks by the point where shaft l6 passes out of the housing l8, it isadapted to pass within the housing l8 through a duct 26.

Housing It! has direct communication with casing I. The shaft 5 isprovided with an outlet 21 which terminates in a number of branch ducts28 communicating with similar ducts 29 formed in the gear l5. Each ofthe ducts 29 is closed by ball check valve 30. Oil is adapted to beplaced within the housing l8 so that the enmeshing teeth 3| of gear [3are adapted to act as a pump for pumping oil through duct 2'! of shaft 5for oiling the bearing 4 and the bearing 32 supported by spider arms 33.The oiling system disclosed is merely one adaptation which may beemployed. The housing 18 is fitted with a drain plug 34.

It will be seen that I have accomplished the objects of my invention. Ihave provided a glandless pump and motor assembly in which the rotor ofthe motor is completely enclosed in a hermetically sealed housing inwhich housing the impeller of the pump is in effect sealed. By providingpole piece extensions integral with the housing surrounding the rotor, Iavoid the magnetic loss which will otherwise render the motor soineflicient that it could not be economically used.

It will be understood that certain features and sub-combinations are ofutility and may be employed without reference to other features andsub-combinations. It is further obvious that various changes may be madein details within the scope of my claim without departing from thespirit of my invention. It is, therefore, to be understood that myinvention is not to be limited to the specific details shown anddescribed.

Having thus described my invention, what I claim is:

A pump and motor assembly comprising in combination a sealed housing ofnon-magnetic material, magnetic inserts forming portions of the walls ofsaid housing and extending therethrough, a rotor of an electric motorpositioned within said housing, a fluid pump, means for operativelyconnecting said rotor with said pump for driving the same, a statorhaving pole pieces, said. magnetic inserts having their outer portionsinclined with respect to the axis of said rotor, said pole pieces havingsurfaces oppositely inclined to the inclinations of said magneticinserts and assembled in superimposed relationship with said magneticinserts whereby said magnetic inserts form extensions of said polepieces, the construction being such that the stator construction may beeasily removed and leakage of fluid being pumped will be into saidsealed housing.

CARL G. HARBORDT.

